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Allowance for Loan Losses - Composition of the Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | $ 49,988 | $ 50,624 | $ 56,494 | $ 54,352
Ending allowance balance attributed to loans |  |  |  |  |
Individually evaluated for impairment |  | 684 | 548 |  |
Collectively evaluated for impairment |  | 49,304 | 50,076 |  |
Total ending allowance balance |  | 49,988 | 50,624 |  |
Loan Balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 56,545 | 70,415 |  |
Loans collectively evaluated for impairment |  | 5,315,938 | 5,201,442 |  |
Total ending loan balance |  | $ 5,372,483 | $ 5,271,857 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 1.21% | 0.78% |  |
Loans collectively evaluated for impairment |  | 0.93% | 0.96% |  |
Total |  | 0.93% | 0.96% |  |
Recorded Investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 56,564 | $ 70,426 |  |
Loans collectively evaluated for impairment |  | 5,332,578 | 5,216,404 |  |
Recorded Investment |  | 5,389,142 | 5,286,830 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 19,403 | 20,799 | 14,290 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (10,210) | (20,030) | (11,442) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 9,193 | 769 | 2,848 |
Provision for Loan, Lease, and Other Losses |  | 8,557 | (5,101) | 4,990 |
Commercial, financial and agricultural |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 15,022 | 13,434 | 13,694 | 10,719
Ending allowance balance attributed to loans |  |  |  |  |
Individually evaluated for impairment |  | 681 | 152 |  |
Collectively evaluated for impairment |  | 14,341 | 13,282 |  |
Total ending allowance balance |  | 15,022 | 13,434 |  |
Loan Balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 18,034 | 20,622 |  |
Loans collectively evaluated for impairment |  | 1,035,419 | 973,997 |  |
Total ending loan balance | [1] | $ 1,053,453 | $ 994,619 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 3.78% | 0.74% |  |
Loans collectively evaluated for impairment |  | 1.39% | 1.36% |  |
Total |  | 1.43% | 1.35% |  |
Recorded Investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 18,039 | $ 20,624 |  |
Loans collectively evaluated for impairment |  | 1,039,827 | 977,553 |  |
Recorded Investment | [1] | 1,057,866 | 998,177 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 6,017 | 5,786 | 2,478 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (809) | (1,259) | (1,373) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 5,208 | 4,527 | 1,105 |
Provision for Loan, Lease, and Other Losses |  | 6,796 | 4,267 | 4,080 |
Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 9,601 | 10,432 | 9,197 | 8,808
Ending allowance balance attributed to loans |  |  |  |  |
Individually evaluated for impairment |  | 2 | 309 |  |
Collectively evaluated for impairment |  | 9,599 | 10,123 |  |
Total ending allowance balance |  | 9,601 | 10,432 |  |
Loan Balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 18,131 | 24,465 |  |
Loans collectively evaluated for impairment |  | 1,149,476 | 1,131,238 |  |
Total ending loan balance | [1] | $ 1,167,607 | $ 1,155,703 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.01% | 1.26% |  |
Loans collectively evaluated for impairment |  | 0.84% | 0.89% |  |
Total |  | 0.82% | 0.90% |  |
Recorded Investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 18,142 | $ 24,474 |  |
Loans collectively evaluated for impairment |  | 1,153,748 | 1,135,390 |  |
Recorded Investment | [1] | 1,171,890 | 1,159,864 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 1,798 | 412 | 348 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (810) | (3,671) | (2,241) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 988 | (3,259) | (1,893) |
Provision for Loan, Lease, and Other Losses |  | 157 | (2,024) | (1,504) |
Construction real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 4,430 | 5,247 | 8,564 | 8,652
Ending allowance balance attributed to loans |  |  |  |  |
Individually evaluated for impairment |  | 0 | 0 |  |
Collectively evaluated for impairment |  | 4,430 | 5,247 |  |
Total ending allowance balance |  | 4,430 | 5,247 |  |
Loan Balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 1,322 | 2,226 |  |
Loans collectively evaluated for impairment |  | 180,148 | 186,719 |  |
Total ending loan balance |  | $ 181,470 | $ 188,945 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.00% | 0.00% |  |
Loans collectively evaluated for impairment |  | 2.46% | 2.81% |  |
Total |  | 2.44% | 2.78% |  |
Recorded Investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 1,324 | $ 2,226 |  |
Loans collectively evaluated for impairment |  | 180,693 | 187,240 |  |
Recorded Investment |  | 182,017 | 189,466 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 105 | 1,436 | 470 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (2,124) | (8,559) | (2,092) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | (2,019) | (7,123) | (1,622) |
Provision for Loan, Lease, and Other Losses |  | (2,836) | (10,440) | (1,710) |
Residential real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 9,321 | 10,958 | 13,514 | 14,772
Ending allowance balance attributed to loans |  |  |  |  |
Individually evaluated for impairment |  | 1 | 87 |  |
Collectively evaluated for impairment |  | 9,320 | 10,871 |  |
Total ending allowance balance |  | 9,321 | 10,958 |  |
Loan Balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 19,058 | 23,102 |  |
Loans collectively evaluated for impairment |  | 1,706,166 | 1,785,395 |  |
Total ending loan balance |  | $ 1,725,224 | $ 1,808,497 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.01% | 0.38% |  |
Loans collectively evaluated for impairment |  | 0.55% | 0.61% |  |
Total |  | 0.54% | 0.61% |  |
Recorded Investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 19,059 | $ 23,102 |  |
Loans collectively evaluated for impairment |  | 1,709,737 | 1,788,714 |  |
Recorded Investment |  | 1,728,796 | 1,811,816 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 1,208 | 3,014 | 2,352 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (1,863) | (2,446) | (2,438) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | (655) | 568 | (86) |
Provision for Loan, Lease, and Other Losses |  | (2,292) | (1,988) | (1,344) |
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 11,614 | 10,553 | 11,524 | 11,401
Ending allowance balance attributed to loans |  |  |  |  |
Individually evaluated for impairment |  | 0 | 0 |  |
Collectively evaluated for impairment |  | 11,614 | 10,553 |  |
Total ending allowance balance |  | 11,614 | 10,553 |  |
Loan Balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0 | 0 |  |
Loans collectively evaluated for impairment |  | 1,241,736 | 1,120,850 |  |
Total ending loan balance |  | $ 1,241,736 | $ 1,120,850 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.00% | 0.00% |  |
Loans collectively evaluated for impairment |  | 0.94% | 0.94% |  |
Total |  | 0.94% | 0.94% |  |
Recorded Investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 0 | $ 0 |  |
Loans collectively evaluated for impairment |  | 1,245,544 | 1,124,235 |  |
Recorded Investment |  | 1,245,544 | 1,124,235 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 10,275 | 10,151 | 8,642 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (4,603) | (4,094) | (3,295) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 5,672 | 6,057 | 5,347 |
Provision for Loan, Lease, and Other Losses |  | 6,733 | 5,086 | 5,470 |
Leases |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 0 | 0 | 1 | $ 0
Ending allowance balance attributed to loans |  |  |  |  |
Individually evaluated for impairment |  | 0 | 0 |  |
Collectively evaluated for impairment |  | 0 | 0 |  |
Total ending allowance balance |  | 0 | 0 |  |
Loan Balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0 | 0 |  |
Loans collectively evaluated for impairment |  | 2,993 | 3,243 |  |
Total ending loan balance |  | $ 2,993 | $ 3,243 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.00% | 0.00% |  |
Loans collectively evaluated for impairment |  | 0.00% | 0.00% |  |
Total |  | 0.00% | 0.00% |  |
Recorded Investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 0 | $ 0 |  |
Loans collectively evaluated for impairment |  | 3,029 | 3,272 |  |
Recorded Investment |  | 3,029 | 3,272 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 0 | 0 | 0 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (1) | (1) | (3) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | (1) | (1) | (3) |
Provision for Loan, Lease, and Other Losses |  | $ (1) | $ (2) | $ (2) |
[1] | Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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